For no pleated header style, like grommet, tab top, rod pocket, back tab, and 4-in-1, if the curtain finished width is over 48 inches, double width is needed with a vertical seam.
For pleated header style, like pinch pleat, tailor pleat, inverted box pleated, or goblet, if the curtain finished width is over 23 inches, double width is needed with a vertical seam.
For pleated header style, like triple pleat, if the curtain finished width is over 18 inches, double width is needed with a vertical seam.
Once you choose triple pleat heading, only privacy liner could be selected.